body {
  background-color: #FFC85E;
}
header {
  width: 100%;
  background-color: #fff;
  overflow: hidden;
}
header .headerCon {
  margin: 0 auto;
  box-sizing: border-box;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
header .headerleft {
  display: flex;
  align-items: center;
}
header .headerleft img {
  height: 56px;
  width: 80px;
}
header .headerleft ul {
  display: flex;
}
header .headerleft ul li {
  margin-left: 40px;
  font-size: 16px;
}
header .headerleft ul li a {
  color: #000;
}
header .headerright span {
  font-size: 24px;
  margin-left: 16px;
  color: #2D2D2D;
}
@media screen and (min-width: 992px) {
  header .headerCon {
    height: 74px;
    width: 1200px;
  }
  header .headerleft img {
    height: 74px;
    width: 107px;
    margin-right: 50px;
  }
  header .headerright span {
    font-size: 26px;
    color: #A3A3A3;
  }
  header .headerright span:hover {
    color: #2D2D2D;
  }
}
@media screen and (max-width: 991px) and (min-width: 768px) {
  header .headerCon {
    height: 56px;
    padding: 0 24px;
  }
  header .headerleft ul {
    display: none;
  }
}
@media screen and (max-width: 767px) {
  header .headerCon {
    height: 56px;
    padding: 0 16px;
  }
  header .headerleft ul {
    display: none;
  }
}
@media screen and (min-width: 992px) {
  nav img {
    margin: 0 auto;
    display: block;
  }
  nav .bannera {
    max-width: 3840px;
    width: 100%;
    height: 550px;
  }
  nav .bannerb {
    width: 1200px;
    height: 42px;
    margin: 20px auto;
  }
  nav .bannerc {
    width: 1200px;
    height: 198px;
  }
  nav .bannerd {
    width: 1200px;
    height: 54px;
    margin: 20px auto;
  }
}
@media screen and (max-width: 991px) and (min-width: 768px) {
  nav .bannerabox {
    width: 50%;
    padding: 10px 24px;
    box-sizing: border-box;
  }
  nav .bannerabox .bannera {
    width: 100%;
    border-radius: 20px;
  }
  nav .bannerb,
  nav .bannerc,
  nav .bannerd {
    display: none;
  }
}
@media screen and (max-width: 767px) {
  nav .bannera {
    width: 100%;
    margin: 10px 0;
  }
  nav .bannerb,
  nav .bannerc,
  nav .bannerd {
    display: none;
  }
}
section {
  width: 1200px;
  margin: 0 auto;
}
section .secBox {
  display: flex;
  flex-wrap: wrap;
}
@media screen and (min-width: 992px) {
  section .secBox {
    margin-left: -20px;
  }
  section .secBox div {
    width: calc(25% - 15px);
    height: 200px;
    margin-left: 15px;
    margin-bottom: 15px;
    background-color: blue;
  }
}
@media screen and (max-width: 991px) and (min-width: 768px) {
  section {
    width: 100%;
    padding: 0 24px;
    box-sizing: border-box;
  }
  section .secBox {
    margin-left: -10px;
  }
  section .secBox div {
    width: calc(33.33% - 10px);
    height: 200px;
    margin-left: 10px;
    margin-bottom: 10px;
    background-color: blue;
  }
}
@media screen and (max-width: 767px) {
  section {
    width: 100%;
    padding: 0 16px;
    box-sizing: border-box;
  }
  section .secBox {
    margin-left: -18px;
  }
  section .secBox div {
    width: calc(50% - 18px);
    height: 200px;
    margin-left: 18px;
    margin-bottom: 18px;
    background-color: blue;
  }
}
